described the Ministry of Defense of America ( the Pentagon ) delivery of Russian air defense systems "S - 300" to Syria , as an act "irresponsible." 

"The decision to supply such defense systems to the Syrian regime is, frankly, irresponsible," the defense ministry said in a statement carried by CNN. 

"This seems to be aimed at providing additional cover for the low-level actions of its partners ( Russia ) - Iran and Syria," the channel quoted the Defense Ministry representative as saying .

Russian Defense Minister Sergei Shoigu said on Tuesday that Russia had handed over to Syria 49 units of military equipment, including four rocket launchers as part of the supply of the S-300 system, aimed at increasing the security of the Russian military in Syria. 

In 2010, Syria contracted the supply of modern S-300 missile defense systems, but at the implementation stage the agreement was canceled at the request of the Israelis. 

In the view of the Israeli side, the new anti-aircraft missiles will not only limit the freedom of air force operations in the airspace of neighboring countries, but will also allow the Syrians to observe almost the entire Israeli airspace. The Israelis justify the need to act freely in Syria in the first place with the presence of Iranian forces.

Russia announced the supply of the S-300 system to Syria in order to increase the security of the Russian military, after the crash of the Russian plane "El-20" on 17 September over the waters of the Mediterranean, 35 kilometers from the Syrian coast off the base of Hameimim air, carrying 15 Military Russia.